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參數(shù)資料
| 型號(hào)： | SC4911IMSTR |
| 廠(chǎng)商： | Semtech Corporation |
| 英文描述： | Bias/Primary Side PWM Controller with Ultra Low Start-up Current |
| 中文描述： | 偏置/小學(xué)側(cè)PWM控制器與超低啟動(dòng)電流 |
| 文件頁(yè)數(shù)： | 9/14頁(yè) |
| 文件大?。?/td> | 228K |
| 代理商： | SC4911IMSTR |
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9
2006 Semtech Corp.
www.semtech.com
SC4911
POWER MANAGEMENT
Typical Applications (Cont.)
Non-Isolated feedback 48V to 12V application
Figure 4
is an example of low cost, non-isolated feedback,
low power application of the SC4911.
T1 is a two winding
transformer. The output voltage is directly fed to the
primary circuitry.
During the start-up, the input source trickle charges the
capacitor C3 through start-up resistor R1. As long as the
voltage across C3 reaches the Vcc turn-on threshold,
the SC4911 turns on abruptly and starts driving the gate
of MOSFET Q1. After the SC4911 starts up the secondary
winding supplies the primary circuitry.
In this 36V to 72V telecom application, LUVLO monitors
the input voltage via resistor R2 and R4 to determine
turn-on and turn-off of the converter. Capacitor C4 helps
filter out the noise from the input line. Voltage feedback
is directly brought from the output to the input error
amplifier of SC4911 through R5 and R7. C6 and R9 are
for frequency compensation. An additional small
capacitor could be used from COMP to GND if needed.
Vo = 12V
C6
47nF
C4
100pF
D1 1N5819
Q1
Si2320DS
C5
150pF
U1 SC4911
1
2
3
4
5
6
7
8
VCC
LUVLO
RT
FB
COMP
ILIM
GND
OUT
C1
47uF
R6
51
C3
10uF
R7
100K
T1
C7
1000pF
R4
100K
D2 1N5819
R8
1.00
C2
10uF
R1
100K
R9
4.7K
R2
2.7MEG
R3
68
R5
383K
Vin = 48V
R10
100K
Figure 4. Non-isolated 48V to 12V Flyback Converter
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SC4911IMSTRT | Bias/Primary Side PWM Controller with Ultra Low Start-up Current |
| SC50-11EWA | 127mm (5.0INCH) SINGLE DIGIT NUMERIC DISPLAYS |
| SC50-11 | 127mm (5.0INCH) SINGLE DIGIT NUMERIC DISPLAYS |
| SC50-11SGWA | 127mm (5.0INCH) SINGLE DIGIT NUMERIC DISPLAYS |
| SC50-11SRWA | 127mm (5.0INCH) SINGLE DIGIT NUMERIC DISPLAYS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC4911IMSTRT | 制造商:Semtech Corporation 功能描述: |
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